[sr-dev] [kamailio/kamailio] Kamailio 5.4.2 - CentOS 7 - qm_free(): BUG: freeing already freed pointer, called from core: core/usr_avp.c: destroy_avp_list_unsafe (#2620)

[Ryan Gehrig]

Adding in `dmesg` info as these are what we see when we crash

```
# rpm -qa | grep glibc
glibc-headers-2.17-260.el7_6.5.x86_64
glibc-2.17-260.el7_6.5.x86_64
glibc-common-2.17-260.el7_6.5.x86_64
glibc-devel-2.17-260.el7_6.5.x86_64
```

```
[Sat Jan 30 08:08:57 2021] kamailio[22756]: segfault at c0c0c0c8 ip 00000000006024be sp 00007ffd4069ff50 error 4 in kamailio[400000+4af000]
[Sat Jan 30 08:27:31 2021] traps: kamailio[640] general protection ip:6024be sp:7ffe53193600 error:0 in kamailio[400000+4af000]
[Sat Jan 30 10:53:21 2021] UDP: bad checksum. From <some public client ip>:22071 to <our public ip>:65535 ulen 583
[Sat Jan 30 14:05:32 2021] traps: kamailio[9455] general protection ip:7f12478121a2 sp:7ffd396648b0 error:0 in dialog.so[7f12477eb000+cd000]
[Sat Jan 30 14:05:42 2021] traps: kamailio[9437] general protection ip:7f124780c931 sp:7ffd39664b20 error:0 in dialog.so[7f12477eb000+cd000]
[Sun Jan 31 00:34:03 2021] traps: kamailio[17610] general protection ip:6024be sp:7fffebc18af0 error:0 in kamailio[400000+4af000]
[Sun Jan 31 11:02:37 2021] traps: kamailio[8222] general protection ip:6024be sp:7ffee67a50b0 error:0 in kamailio[400000+4af000]
[Sun Jan 31 11:20:46 2021] traps: kamailio[26901] general protection ip:6024be sp:7ffe6be8df40 error:0 in kamailio[400000+4af000]
[Sun Jan 31 11:45:30 2021] kamailio[3055]: segfault at 3 ip 00007f70cbadeef9 sp 00007fffcfd2d520 error 4 in libc-2.17.so[7f70cba92000+1c2000]
[Sun Jan 31 15:59:56 2021] kamailio[14268]: segfault at 22 ip 00007f86b5b46035 sp 00007fffb896d8f0 error 4 in dialog.so[7f86b5b0f000+cd000]
[Sun Jan 31 16:00:06 2021] traps: kamailio[14242] general protection ip:7f86b5b8ebb3 sp:7fffb896d990 error:0 in dialog.so[7f86b5b0f000+cd000]
[Sun Jan 31 17:31:17 2021] traps: kamailio[11912] general protection ip:6024be sp:7fff6222f1b0 error:0 in kamailio[400000+4af000]
[Mon Feb  1 05:12:03 2021] traps: kamailio[15669] general protection ip:7f5cc4c63ef9 sp:7ffdab5be2c0 error:0 in libc-2.17.so[7f5cc4c17000+1c2000]
[Mon Feb  1 06:26:36 2021] traps: kamailio[6190] general protection ip:6024be sp:7fffdc80bab0 error:0 in kamailio[400000+4af000]
[Mon Feb  1 08:10:28 2021] kamailio[8169]: segfault at 7 ip 00007f200d17eef9 sp 00007ffccd228360 error 4 in libc-2.17.so[7f200d132000+1c2000]
[Mon Feb  1 11:08:44 2021] kamailio[6226]: segfault at 28 ip 00007f732e500ef9 sp 00007ffe0f649620 error 4 in libc-2.17.so[7f732e4b4000+1c2000]
[Mon Feb  1 14:30:13 2021] kamailio[24829]: segfault at c ip 00000000006024be sp 00007fff2aacafd0 error 4 in kamailio[400000+4af000]
[Mon Feb  1 15:38:56 2021] kamailio[2157]: segfault at f0f0f0f8 ip 00007f5cb99601a2 sp 00007ffcb079b070 error 4 in dialog.so[7f5cb9939000+cd000]
[Mon Feb  1 15:39:06 2021] kamailio[2093]: segfault at f0f0f110 ip 00007f5cb995a931 sp 00007ffcb079b2e0 error 4 in dialog.so[7f5cb9939000+cd000]
[Mon Feb  1 15:58:23 2021] kamailio[1014]: segfault at c0c0c0c8 ip 00000000006024be sp 00007ffe6a339590 error 4 in kamailio[400000+4af000]
[Tue Feb  2 01:03:57 2021] kamailio[4755]: segfault at 229 ip 00000000006024be sp 00007ffc4fc04590 error 4 in kamailio[400000+4af000]
[Tue Feb  2 09:01:57 2021] traps: kamailio[6179] general protection ip:6024be sp:7ffcd941ec20 error:0 in kamailio[400000+4af000]
[Tue Feb  2 09:57:03 2021] kamailio[25176]: segfault at 10 ip 00000000006024be sp 00007fff0b5c9620 error 4 in kamailio[400000+4af000]
[Tue Feb  2 10:05:43 2021] traps: kamailio[18233] general protection ip:6024be sp:7ffd0e595f70 error:0 in kamailio[400000+4af000]
[Tue Feb  2 10:39:32 2021] traps: kamailio[22574] general protection ip:6024be sp:7ffee87edc30 error:0 in kamailio[400000+4af000]
[Tue Feb  2 11:16:58 2021] traps: kamailio[5711] general protection ip:7f83d42c5931 sp:7ffe25ab7880 error:0 in dialog.so[7f83d42a4000+cd000]
[Tue Feb  2 11:17:08 2021] traps: kamailio[5682] general protection ip:7f83d42c5931 sp:7ffe25aba530 error:0 in dialog.so[7f83d42a4000+cd000]
[Tue Feb  2 11:51:00 2021] traps: kamailio[22527] general protection ip:7fbd54be1ef9 sp:7ffdf86303f0 error:0 in libc-2.17.so[7fbd54b95000+1c2000]
[Tue Feb  2 12:17:00 2021] kamailio[5721]: segfault at 3 ip 00007f569bdeaef9 sp 00007fff625860b0 error 4 in libc-2.17.so[7f569bd9e000+1c2000]
[Tue Feb  2 14:10:50 2021] kamailio[17395]: segfault at 4e ip 00000000006024be sp 00007ffd38eb78b0 error 4 in kamailio[400000+4af000]
[Tue Feb  2 14:13:19 2021] traps: kamailio[5376] general protection ip:6024be sp:7ffd52be6f70 error:0 in kamailio[400000+4af000]
[Wed Feb  3 08:59:27 2021] traps: kamailio[16759] general protection ip:7f85ba1719c3 sp:7ffd629152c0 error:0 in dialog.so[7f85ba150000+cd000]
```

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